一种MIMO时间相干信道下的有限反馈新方法

A New Limited Feedback Approach Based on Channel Prediction over Temporally-correlated Channels

针对时间相干MIMO信道下存在时间冗余的问题,提出了一种基于信道预测的有限反馈新方法.该方法利用相邻数据帧的时间相干性,结合AR模型预测信道状态信息,并在码书中找到一个最优的码字使多个数据帧的系统性能综合最优,将该码字反馈给发送端用于发射预处理.仿真结果表明,与传统反馈方法相比,虽然该反馈方法的系统性能有所降低,但是反馈开销显著降低,因此在两者之间获得较好的折中.

In view of the problem of the temporal redundancy in temporally-correlated MIMO channels, a new limited feedback approach based on channel prediction is proposed in this paper. Both the temporal coherence of the adjacent data frames and AR prediction model are used to predict channel state information and find an optimal codeword which is utilized to get an integrated optimal system performance of data frames and feedback it to sender. The simulation results show, while the system performance of the feedback approach proposed has decreased compared with the traditional one, but the feedback costs are significantly reduced, so the performance loss is acceptable.